A dataset of 1km Grid Cultivated Land Fragmentation in China(2020）

Cultivated land fragmentation is a quantitative description of cultivated land fragmentation. Cultivated land fragmentation means that due to natural or human factors, the number of cultivated land patches increases, the size of patches decreases, and the degree of isolation increases, showing a scattered and disorderly pattern. Fragmentation will not only affect the structure and function of the ecosystem, but also be detrimental to improving the utilization efficiency of cultivated land resources and the scale effect of grain production. If land property rights are not considered, the impact of human activities on cultivated land is mainly concentrated on the landscape level, and the landscape pattern index can largely summarize the information of land use pattern and reflect the characteristics of land spatial allocation. Therefore, this data set is based on the grid data of the 2020 annual change survey of the whole country (except Hong Kong, Macao and Taiwan), and three landscape pattern indexes, namely patch density index, separation index and separation index of landscape cultivated land types, are used to characterize the fragmentation characteristics of regional cultivated land, providing spatial decision support for the protection and sustainable utilization of regional cultivated land resources.耕地破碎化是对耕地空间破碎程度的量化表征。耕地破碎化指受自然或人为因素影响，耕地斑块数量增多、斑块面积缩减、斑块隔离程度提升，整体呈现零散无序的空间格局。耕地破碎化不仅会破坏生态系统的结构与功能，还会降低耕地资源利用效率，削弱粮食生产的规模效应。若不考虑土地产权因素，人类活动对耕地的影响主要集中在景观尺度，而景观格局指数（landscape pattern index）可在较大程度上概括土地利用格局信息，反映土地空间配置特征。因此，本数据集以全国（港澳台除外）2020年度土地变更调查栅格数据为基础，选取斑块密度指数（patch density index）、分离度指数（separation index）以及景观耕地类型分离度指数（separation index of landscape cultivated land types）三类景观格局指数，表征区域耕地的破碎化特征，为区域耕地资源保护与可持续利用提供空间决策支持。